Mitochondria provides energy as the cellular respiration takes place in it. It is also known as power house of the cell.
DNA stores genetic information in the form of choromoses . In chromoses there is a chromatin material which has all the information needed to the cell for survival and function and the chemical reaction that has taken place.
Lysosome fight against infections. it is garbage disposal system to the cell. If any of the orgenelles get infected or do not work well the lysosome brust and the enzymes prenet in it eats up the whole cell.